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Very unusual. The rear set of duals looks like the extra"tag" axle seen on some modern cement trucks to compensate for heavy loads. Was that axle a driven axle that was connected to the drive line of a. Accessory axle for heavy jobs?

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No, the rear most axle was just for the weight, like a tag axle but not able to raise it. The front tandem was driven, chain drive of course. Hoist weight center appears to be in the middle of the two tandem axles. I was equally amazed by the size of the hook to the right!